What pressure drop is used to determine the nominal tonnage of an R-22 TXV?

To determine the nominal tonnage of an R-22 thermostatic expansion valve (TXV), a pressure drop of 100 psi is utilized. This specific pressure drop is significant because it reflects the typical operational conditions that the TXV will experience during the refrigeration cycle.

This 100 psi drop is used to calculate the capacity of the system accurately. It enables technicians to determine how the valve will respond to varying loads and ensures that the system can maintain its performance under standard conditions. By matching the appropriate pressure drop to the system's tonnage, technicians can confirm the proper sizing and operation of the TXV, which is crucial for achieving optimal efficiency and effectiveness in heat exchange processes.

This level of knowledge allows technicians to make informed decisions about parts and maintenance, helping to enhance the reliability and longevity of the refrigeration system.